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Wire library: fixed Master-mode
This commit is contained in:
Cristian Maglie
parent
1b4cd35e9d
commit
eef7c78506
@ -19,45 +19,66 @@
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extern "C" {
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#include <string.h>
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#include <inttypes.h>
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#include "twi.h"
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}
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#include "Wire.h"
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static inline void TWI_WaitTransferComplete(Twi *_twi) {
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while (!TWI_TransferComplete(_twi))
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;
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static inline bool TWI_FailedAcknowledge(Twi *pTwi) {
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return pTwi->TWI_SR & TWI_SR_NACK;
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}
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static inline void TWI_WaitByteSent(Twi *_twi) {
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while (!TWI_ByteSent(_twi))
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;
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static inline bool TWI_WaitTransferComplete(Twi *_twi, uint32_t _timeout) {
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while (!TWI_TransferComplete(_twi)) {
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if (TWI_FailedAcknowledge(_twi))
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return false;
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if (--_timeout == 0)
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return false;
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}
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return true;
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}
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static inline void TWI_WaitByteReceived(Twi *_twi) {
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while (!TWI_ByteReceived(_twi))
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;
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static inline bool TWI_WaitByteSent(Twi *_twi, uint32_t _timeout) {
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while (!TWI_ByteSent(_twi)) {
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if (TWI_FailedAcknowledge(_twi))
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return false;
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if (--_timeout == 0)
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return false;
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}
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return true;
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}
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static inline bool TWI_WaitByteReceived(Twi *_twi, uint32_t _timeout) {
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while (!TWI_ByteReceived(_twi)) {
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if (TWI_FailedAcknowledge(_twi))
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return false;
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if (--_timeout == 0)
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return false;
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}
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return true;
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}
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static inline bool TWI_STATUS_SVREAD(uint32_t status) {
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return (status & TWI_SR_SVREAD) == TWI_SR_SVREAD;
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}
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DueWire::DueWire(Twi *_twi) :
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DueWire::DueWire(Twi *_twi, void(*_beginCb)(void)) :
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twi(_twi), rxBufferIndex(0), rxBufferLength(0), txAddress(0),
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txBufferLength(0), srvBufferIndex(0), srvBufferLength(0), status(
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UNINITIALIZED) {
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UNINITIALIZED), onBeginCallback(_beginCb) {
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// Empty
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}
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void DueWire::begin(void) {
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// TODO: correct clock values
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TWI_ConfigureMaster(twi, 200000, 200000);
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if (onBeginCallback)
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onBeginCallback();
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TWI_ConfigureMaster(twi, TWI_CLOCK, VARIANT_MCK);
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status = MASTER_IDLE;
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}
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void DueWire::begin(uint8_t address) {
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if (onBeginCallback)
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onBeginCallback();
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TWI_ConfigureSlave(twi, address);
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status = SLAVE_IDLE;
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TWI_EnableIt(twi, TWI_IER_RXRDY | TWI_IER_TXRDY | TWI_IER_TXCOMP);
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@ -75,14 +96,14 @@ uint8_t DueWire::requestFrom(uint8_t address, uint8_t quantity) {
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int readed = 0;
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TWI_StartRead(twi, address, 0, 0);
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do {
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// Stop condition must be set during the receprion of last byte
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// Stop condition must be set during the reception of last byte
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if (readed + 1 == quantity)
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TWI_SendSTOPCondition( twi);
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TWI_WaitByteReceived( twi);
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TWI_WaitByteReceived(twi, RECV_TIMEOUT);
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rxBuffer[readed++] = TWI_ReadByte(twi);
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} while (readed < quantity);
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TWI_WaitTransferComplete( twi);
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TWI_WaitTransferComplete(twi, RECV_TIMEOUT);
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// set rx buffer iterator vars
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rxBufferIndex = 0;
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@ -110,14 +131,14 @@ void DueWire::beginTransmission(int address) {
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uint8_t DueWire::endTransmission(void) {
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// transmit buffer (blocking)
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TWI_StartWrite(twi, txAddress, 0, 0, txBuffer[0]);
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TWI_WaitByteSent( twi);
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TWI_WaitByteSent(twi, XMIT_TIMEOUT);
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int sent = 1;
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while (sent < txBufferLength) {
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TWI_WriteByte(twi, txBuffer[sent++]);
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TWI_WaitByteSent(twi);
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TWI_WaitByteSent(twi, XMIT_TIMEOUT);
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}
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TWI_Stop(twi);
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TWI_WaitTransferComplete(twi);
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TWI_Stop( twi);
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TWI_WaitTransferComplete(twi, XMIT_TIMEOUT);
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// empty buffer
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txBufferLength = 0;
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@ -175,7 +196,8 @@ int DueWire::peek(void) {
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}
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void DueWire::flush(void) {
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// XXX: to be implemented.
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// Do nothing, use endTransmission(..) to force
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// data transfer.
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}
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void DueWire::onReceive(void(*function)(int)) {
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@ -190,8 +212,9 @@ void DueWire::onService(void) {
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// Retrieve interrupt status
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uint32_t sr = TWI_GetMaskedStatus(twi);
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// Detect if we should go into RECV or SEND status
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// SLAVE_IDLE status
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if (status == SLAVE_IDLE) {
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// Detect if we should go into RECV or SEND status
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srvBufferLength = 0;
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if (TWI_STATUS_SVREAD(sr)) {
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status = SLAVE_RECV;
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@ -200,15 +223,15 @@ void DueWire::onService(void) {
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status = SLAVE_SEND;
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// Alert calling program to generate a response ASAP
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if (onRequestCallback != NULL)
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if (onRequestCallback)
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onRequestCallback();
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else
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// default response
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// create a default 1-byte response
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write((uint8_t) 0);
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}
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}
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// Receive packet
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// SLAVE_RECV status: receiving packet
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if (status == SLAVE_RECV) {
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if (TWI_STATUS_RXRDY(sr)) {
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if (srvBufferLength < BUFFER_LENGTH)
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@ -219,7 +242,7 @@ void DueWire::onService(void) {
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status = SLAVE_IDLE;
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// Alert calling program
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if (onReceiveCallback != NULL) {
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if (onReceiveCallback) {
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// Copy data into rxBuffer
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// (allows to receive another packet while
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// the main application reads actual data)
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@ -233,7 +256,7 @@ void DueWire::onService(void) {
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}
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}
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// Send packet
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// SLAVE_SEND status: sending packet
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if (status == SLAVE_SEND) {
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if (TWI_STATUS_TXRDY(sr)) {
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uint8_t c = 0;
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@ -249,13 +272,42 @@ void DueWire::onService(void) {
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}
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}
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DueWire Wire = DueWire(TWI0);
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DueWire Wire2 = DueWire(TWI1);
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void TWI0_IrqHandler(void) {
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Wire.onService();
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#if WIRE_INTERFACES_COUNT > 0
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static void Wire_Init(void) {
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PMC_EnablePeripheral( WIRE_INTERFACE_ID);
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PIO_Configure(g_APinDescription[PIN_WIRE_SDA].pPort,
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g_APinDescription[PIN_WIRE_SDA].ulPinType,
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g_APinDescription[PIN_WIRE_SDA].ulPin,
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g_APinDescription[PIN_WIRE_SDA].ulPinConfiguration);
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PIO_Configure(g_APinDescription[PIN_WIRE_SCL].pPort,
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g_APinDescription[PIN_WIRE_SCL].ulPinType,
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g_APinDescription[PIN_WIRE_SCL].ulPin,
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g_APinDescription[PIN_WIRE_SCL].ulPinConfiguration);
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}
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DueWire Wire = DueWire(WIRE_INTERFACE, Wire_Init);
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void TWI1_IrqHandler(void) {
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Wire2.onService();
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Wire.onService();
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}
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#endif
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#if WIRE_INTERFACES_COUNT > 1
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static void Wire1_Init(void) {
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PMC_EnablePeripheral( WIRE1_INTERFACE_ID);
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PIO_Configure(g_APinDescription[PIN_WIRE1_SDA].pPort,
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g_APinDescription[PIN_WIRE1_SDA].ulPinType,
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g_APinDescription[PIN_WIRE1_SDA].ulPin,
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g_APinDescription[PIN_WIRE1_SDA].ulPinConfiguration);
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PIO_Configure(g_APinDescription[PIN_WIRE1_SCL].pPort,
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g_APinDescription[PIN_WIRE1_SCL].ulPinType,
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g_APinDescription[PIN_WIRE1_SCL].ulPin,
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g_APinDescription[PIN_WIRE1_SCL].ulPinConfiguration);
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}
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DueWire Wire1 = DueWire(WIRE1_INTERFACE, Wire1_Init);
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void TWI0_IrqHandler(void) {
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Wire1.onService();
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}
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#endif
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@ -21,15 +21,15 @@
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#ifndef DueWire_h
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#define DueWire_h
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#include <inttypes.h>
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#include "Stream.h"
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#include "twi.h"
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#include "variant.h"
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#define BUFFER_LENGTH 32
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class DueWire: public Stream {
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public:
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DueWire(Twi *);
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DueWire(Twi *twi, void(*begin_cb)(void));
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void begin();
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void begin(uint8_t);
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void begin(int);
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@ -70,22 +70,38 @@ private:
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void (*onRequestCallback)(void);
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void (*onReceiveCallback)(int);
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// Called before initialization
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void (*onBeginCallback)(void);
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// TWI instance
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Twi *twi;
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// TWI state
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static const uint8_t UNINITIALIZED = 0;
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static const uint8_t MASTER_IDLE = 1;
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static const uint8_t MASTER_SEND = 2;
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static const uint8_t MASTER_RECV = 3;
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static const uint8_t SLAVE_IDLE = 4;
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static const uint8_t SLAVE_RECV = 5;
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static const uint8_t SLAVE_SEND = 6;
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uint8_t status;
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enum DueWireStatus {
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UNINITIALIZED,
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MASTER_IDLE,
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MASTER_SEND,
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MASTER_RECV,
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SLAVE_IDLE,
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SLAVE_RECV,
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SLAVE_SEND
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};
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DueWireStatus status;
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// TWI clock frequency
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static const uint32_t TWI_CLOCK = 100000;
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// Timeouts (
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static const uint32_t RECV_TIMEOUT = 100000;
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static const uint32_t XMIT_TIMEOUT = 100000;
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};
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#if WIRE_INTERFACES_COUNT > 0
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extern DueWire Wire;
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extern DueWire Wire2;
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#endif
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#if WIRE_INTERFACES_COUNT > 1
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extern DueWire Wire1;
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#endif
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#endif
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@ -24,8 +24,10 @@
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*----------------------------------------------------------------------------*/
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#include "Arduino.h"
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#ifdef __cplusplus
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#include "UARTClass.h"
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#include "USARTClass.h"
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#endif
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/**
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* Libc porting layers
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@ -69,6 +71,18 @@
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#define PIN_LED2 PIN_LED_RXL
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#define PIN_LED3 PIN_LED_TXL
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#define WIRE_INTERFACES_COUNT 2
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#define PIN_WIRE_SDA (20u)
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#define PIN_WIRE_SCL (21u)
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#define WIRE_INTERFACE TWI1
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#define WIRE_INTERFACE_ID ID_TWI1
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#define PIN_WIRE1_SDA (68u)
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#define PIN_WIRE1_SCL (69u)
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#define WIRE1_INTERFACE TWI0
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#define WIRE1_INTERFACE_ID ID_TWI0
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#define PINS_UART (80u)
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#define PINS_USART0 (81u)
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